package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

import static com.sky.constant.AutoFillConstant.*;

//自定义切面
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点

    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
//前置通知，在通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充");
        //获取到当前被拦截的方法上的注解
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取到当前被拦截的方法
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取到注解
        OperationType operationType = autoFill.value();//获取到需要自动填充的操作类型

        //获取到当前被拦截的方法的参数-实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];


        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前传入的实体对象，为对应的属性进行赋值
        if (operationType == OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);

                //通过反射为属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);

                //通过反射为属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }



        }

    }
}
